When his estranged wife deposits his teenage son Julian at the doorstep of his remote caravan home, solitary (though charming) poacher Francis must amend his ways, take on new responsibilities and engage with the world. But just as the two begin to bond, Julian takes a friend into the woods where an accident occurs that puts them under the authorities’ spotlight. They must make a decision that will forever change their lives.

Whilst on a family scuba diving trip the Kelvin family surface to find that the world's oxygen supply has suddenly dissipated. With their tanks running low they embark on a race against time to reach the nearby dive hut.